Yes, primitive cetaceans likely fed in a manner similar to marine reptiles. In the Eocene epoch, primitive cetaceans known as basilosaurids were among the dominant marine predators. They possessed elongated body plans resembling giant snakes or marine reptiles and inhabited nearshore and offshore environments.

Like many marine reptiles, primitive cetaceans are believed to have been ambush predators or active pursuit predators. With streamlined bodies and powerful, serpentine swimming capabilities, they would have efficiently navigated aquatic environments in search of prey. Their powerful jaws and robust dentition, consisting of sharp, conical teeth, were well-suited for capturing and subduing a variety of prey, including fish, cephalopods, and even smaller marine mammals. Some primitive cetaceans may have employed ram feeding or suction feeding techniques, similar to certain marine reptiles, to enhance their feeding efficiency.